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Published on: November 20, 2018
Nanoparticles containing octreotide peptides and gadolinium complexes for MRI applications
Antonella Accardo1, Anna Morisco, Eliana Gianolio
1Department of Biological Sciences, CIRPeB, University of Naples Federico II, & IBB CNR, Via Mezzocannone 16, 80134 Naples, Italy.
Summary
Researchers created novel nanoparticles by self-assembling amphiphilic monomers, including octreotide. These nanoparticles show potential as MRI contrast agents with specific binding capabilities.
Area of Science:
- Materials Science
- Nanotechnology
- Biomedical Engineering
Background:
- Amphiphilic monomers self-assemble into nanoparticles for various applications.
- Octreotide is a peptide-based drug used in treating neuroendocrine tumors.
- Gadolinium (Gd) complexes are widely used as contrast agents in Magnetic Resonance Imaging (MRI).
Purpose of the Study:
- To synthesize and characterize novel mixed nanoparticles formed by self-aggregation of amphiphilic monomers.
- To incorporate the bioactive peptide octreotide into these nanoparticles for targeted delivery.
- To evaluate the potential of these nanoparticles as MRI contrast agents with specific receptor binding.
Main Methods:
- Synthesis of amphiphilic monomers with hydrophobic moieties and polyamino-polycarboxy ligands (DTPAGlu, DTPA, DOTA).
- Structural characterization of mixed aggregates using small-angle neutron scattering (SANS).
- Evaluation of relaxometric behavior and proton relaxivity of Gadolinium (Gd) complexes.
Main Results:
- Mixed nanoparticles were successfully formed and characterized.
- A transition from micelle to vesicle structures was observed with decreasing negative charges in the head-group.
- Proton relaxivity values of 17.6, 15.2, and 10.0 mM⁻¹s⁻¹ were measured for different Gd-complexes.
- Low water molecule mobility at the peptide surface was indicated by tryptophan fluorescence.
Conclusions:
- The synthesized mixed nanoparticles exhibit tunable structural properties and relaxometric behavior.
- Incorporation of octreotide-based monomers provides potential for somatostatin receptor subtype selectivity.
- These nanoparticles show promise as targeted MRI contrast agents for specific medical applications.
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